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Derivative Instruments (Offsetting Assets) (Detail) - USD ($)
$ in Thousands
Jan. 31, 2019
Jan. 31, 2018
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets $ 22,570 $ 98
Gross Amounts Offset on the Consolidated Balance Sheets 0  
Net Amounts of Assets Presented on the Consolidated Balance Sheets 22,570  
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments (3,135)  
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Received 0  
Net Assets Exposed 19,435  
Counterparty A    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 2,305  
Gross Amounts Offset on the Consolidated Balance Sheets 0  
Net Amounts of Assets Presented on the Consolidated Balance Sheets 2,305  
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments (78)  
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Received 0  
Net Assets Exposed 2,227  
Counterparty B    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 18,053  
Gross Amounts Offset on the Consolidated Balance Sheets 0  
Net Amounts of Assets Presented on the Consolidated Balance Sheets 18,053  
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments (1,823)  
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Received 0  
Net Assets Exposed 16,230  
Counterparty C    
Offsetting Assets [Line Items]    
Gross Amounts of Recognized Assets 2,212  
Gross Amounts Offset on the Consolidated Balance Sheets 0  
Net Amounts of Assets Presented on the Consolidated Balance Sheets 2,212  
Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments (1,234)  
Gross Amounts Not Offset in the Consolidated Balance Sheets, Cash Collateral Received 0  
Net Assets Exposed $ 978